Process for manufacturing laminated articles



April 2,1942. B; J. DENNlsoN 2,2813027` 1 PROCESS FOR MANUFACTURING LAMINTEDRTICLES Filed July 31, 194017 Fig-l- @zwi/ 24@ 3mm lzoo k J DENN/60N www . will serve the desired purpose.

` `Patented Apr. 28,1942

s PATENT OFFICE t ROCSS FOB MANUFACTURING LAMI- NATED ARTICLES i t Brook J. Dennison, Aspinwall, Pa., assigner to Pittsburgh `Plate Glass Company, Allegheny` Y County, Pa., afcorporation of Pennsylvania i `Applicaties July ai, 1940, serial No. 348,775 i claims. (ci. 154-2) The present invention relatesto a process of manufacturing laminated articles `and more pari ticularly to articles `which. includeasheet of` glass and akthin sheet of ply wood or veneer.

One object of the invention is the provision of is` .facilitated `and the; layer of wood is protected during such lamination. y

Other objects and advantages of the invention will become more `apparent from the following detailed description of a` preferred embodiment thereof.

Cil

w means whereby the. lamination of wood to glass There has recently been evidenced a demand i forxpanels of laminated glass-woodas a construction material.. The wood veneer is protected by` the layer of `glassfroin surface deteriorader 3. The sheet has secured thereto a baci;`

pressing `under the influence of `whichthe sev? eral elements aretemporarily secured together in order that they may be `handled and the projecting border 3 of the thermoplastic layer and the border i of the4 metalioil are bonded together at l, to form an impermeable envelope for` the sheet I of wood. The assembly is then placed directly in an` autoclave wherein pressure exerted by a heated fluid bonds the several ele. ments into a composite unit. Sincethe layer I of wood is entirely enclosed the autoclave fluid will notpenetraiie therein to preclude the forma` tion and yet at the same time the beauty and attractiveness of the wood grain is not impaired.

In generalthe laminated glass-wood is manufactured by processes similar to those employed in` the `manufacture `of; ordinary safety glass.` The sheets of glass and wood are assembled withl a` l layer of thermoplastic material interposed i therebetween and the assembly lis subjected to Obviously such expedient materially increases of the manufacturing process. A

Briefly stated, `the present: invention contem-` The usual tion of Aa satisfactory bond between the wood and glass.

After the lamination operation has been completed the edges of the unit are trimmed to remove `the surplus materiall forming the envelope and the `laminated article isready foi'use.l

Any of the thermoplastic materials ordinarily used in theproduction of safety glass, including cellulosic derivatives, the acrylate resins and the polyvinyl acetals may be used to unite sheets of wood and glass. Although it is preferred to use a polyvinyl butyral because of its increased re-` sistance to fluid penetration, it is not intended to restrict the process to `anyparticular thermoplastic material.

`the 1 cost of production by necessitating extra i `operations and reducingthespeed plates the formation of animpermeablel envelope l `around the sheet of wood from the elements of the assembly, thus eliminating the need for separate protective coverings.` i i In the drawing Figure` lis a verticalsectional view of an assembly prior to the laminating op Referring to the drawing a sheet I of glass and assembled withan interposed layer 2 of thermoplastic material. The layerl 2` extends beyond the edges of thelsheets l` and! and forms a bor- It will also be apparent thatvarious modifications in the types of materials selected and the conditions under which the process iszperformed are possible without departing from the spirit of the invention or` the scope of the appended claims. v l l What I claim is:

1. A process of `manufacturing a laminated article which comprises supex'posing` a plurality of laminations with interposed plastic adhesive material` in sheet form extending beyond the` edges of the laminations,` applying covering non-` porous sheet material also extendingbeyond the edges or the lamination. closing theex'tending edge portions of the covering and interposed plastic, and subjecting the assembled elements to heat and fluid pressure. w w

2. A process of manufacturing a laminated article which comprises superposing a plurality w of laminations with interposed plastic` adhesive la sheet 4 ofl wood or other similar material are material in sheet form extending beyond the edges of the laminations. applying a covering non-porous sheet material also extending beyond the; edges `of the laminations, closing theexthe non-porous backingto forma protective en. velope around the sheet of wood, and subjecting the assembly to heat and iiuid pressure.

4. A process of manufacturing a laminated article which comprises assembling a sheet of glass and a sheet of wood, interposing a layer of L 'thermoplastic material between the glass and wood, adhering a non-porous backing to the 2,2s1,oa7 t wood, bonding the thermoplastic material to the non-porous backing to form an impermeable envelope for the sheet of woods and subjecting the assembly to heat and nuid pressure to bond the several elements into a composite unit.

5. A process of manufacturing a laminated article which comprises assembling 'a sheet vof glass and a sheet o1 wood, interposing a layer of thermoplastic material between the glass and wood and extending beyond the edges thereof, adhering a non-porous backing of metal foil to the wood, the backing also extending beyond the edges of the wood, bonding the extending portions of the thermoplastic material and metal foil together to form an impermeable envelope for the sheet oi' wood, and subjecting the assembly to heat and fluid pressure to bond the several elements into a composite unit.

, BROOK J. DENNISON. 

